Effective Modelling of Phenomena in Over-Moisture Zone Existing in Porous Sand Mould Subjected to Thermal Shock
[ 1 ] Instytut Technologii Materiałów, Wydział Budowy Maszyn i Zarządzania, Politechnika Poznańska | [ P ] employee
2016
chapter in monograph
english
EN The problem concerns the thermo-physical properties of the porous ceramic material called mould to which the liquid metal is poured (in foundry industry). In the foundry processes the sand mould fulfils an auxiliary role only as technological tool, but its physical and technological properties determine the quality of the casting. The study includes the iron plate casting experiments poured in multi-component porous sand mould. The temperature fields in casting and in different zones of the mould were recorded. The determining of the thermo-physical properties of mould sand containing the over-moisture zone using simulation tests by Procast and NovaFlow & Solid foundry systems was the goal of this study. An originality of the related research is an attempt to take into account the effects of the global thermal phenomena occurring in the quartz sand bonded by bentonite-water binder, using the apparent (substitute) thermal coefficients. The majority of foundry simulation systems are not capable to modelling the phase transformation of water into vapour, vapour transport and its condensation in porous media (called green sand moulds). In these cases the application of heat and mass transfer substitute coefficients during modelling/simulation is an interesting effective way.
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